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Question

When a reddish brown metal X comes in contact with air and moisture, it forms a green covering of metal carbonate over the metal X. What is X?


A

Copper

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B

Iron

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C

Aluminium

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D

Zinc

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Solution

The correct option is A

Copper


When reddish brown metal copper comes in contact with air and moisture, it gets covered with a green layer of basic copper carbonate in the presence of CO2 and moisture.

2Cu+O2+CO2+H2OCuCO3.Cu(OH)2


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